Driving device



1941 R. o. ALLEN 2,272,760

DRIVING DEVICE Filed Dec. 18, 1940 INVENTOR R0 OZIZZ'en/ M H a sATTORNEY.

Patented Feb. 10, 1942 UNITED STATE nnrvnvc DEVICE Roy 0. Allen, Athens,Pa.,

assignor to' lngersoll- RandCompany, New York',N. "2., a corporationof'New Je y,

Application'December 1 s, 1940, Serial No. 370,670

{5 01am (01.1-46.1) I e r, 29 the front end of which constitutes astrik- This'invention relates to driving devices, and

more particularlyto a driving device-adapted for attachment to apneumatically actuated hammer tool of the type employed for driving railroad spikes and similar articles. 9

One object of the invention is to enable the hammer tool to beconveniently retainedin the correct driving relationship with the spike,uneffected by the vibration incident to the operation of the hammertool.

Another object is to enable the driving device to be expeditiouslyattached to and removed from the hammer tool without disturbing theassembled relationship of the parts constituting the hammer tool.

Other objects will be in part obvious and in part pointed outhereinafter.- a

In the drawing accompanying this specification and in which similarreference numerals refer to similar parts:

Figure 1 is an elevation, partly in section, of the front end of ahammer-tool and the driving device, and

Figure'2 is a transverse view taken through Figure 1 on the line 2--2.

Referring more particularly to the drawing, the driving device,designated in general by 26, is shown attached to a hammer tool 2| onlythe forward portion of the casing 22 of which is shown, and in thecasing 22 is a hammer member 23 for actuating the driving device.

The driving device 20, constructed in accordance with the practice ofthe invention, comprises a shank 24 that extends into the front end ofthe casing 22 to receive the blows of the hammer 23, and on the shank 24is a flange 25 to abut the front end of the casing 22 for limiting thedistance that the shank 24 may extend into the casing.

The front portion of the flange is of reduced diameter to provide aforwardly facing shoulder 26 intermediate theends of the flange forengagement with a. retaining element, asfor example, the end coil 21 ofa spiral spring retainer 28, of a well known type, having several of itsrearmost coils in threaded engagement with the periphery of the casing22. The coils intermediate those threaded to the casing and the oneengaging the shoulder 26 encircle the casing loosely and are, therefore,quite free'to flex whenever the driving device isimpelled forwardly inthe casing by the hammer 23 and to again return the driving device tothe correct operative relationship with the hammer 23. ,On the front endof the fiange 25 ing surface 30 to seat upon the head of a spike 3| fordriving the spike into a tie 32 to secure a rail 33 thereto. Owing tothe peculiarcurvature of the driving surface of. the head of a spike thestriking surface 30 is preferably flat throughout its extentso that, ifrequired, the tool 2 l may be tilted relatively to the :spike and thefull force of'the hammer 23 will be effective for-driving the spike intothe tie; In order .tdmaintain the strikingss'urface in substantiallyithecorrect relationship with the work the stem 23 is provided with aguiding element adapted to loosely receive the head of .the spike. r

The guiding element is preferably attached permanently to the stem 2.9.It lSJShOWl'l. as bein'gin the form of a sleeve 34 havinga bore 35extending entirely therethrough and I consisting of enlarged'andreducedportions 35 and 3], re- 'spectively. The reduced portion.3'l of the boreis'in'slidable engagement with the forward-por- "tionof the stem 29 toassist in guiding the sleeve 34; and between the ends of the stem'29 isacollar 38 having a cylindrical surface 39lto cooperate with the surfaceof the enlarged portion 36 of the bore to guidetherearward end of thesleeve 34.

At the rearwarden'd of the sleeve 34 is an introverted flange 40 thatoverlies and cooperates with the rearward surface of the collar 38 tomaintain the sleeve 34 on the stem 29. The flange 40 is preferably anintegral portion of the sleeve and may be conveniently formed bycrimping the end of the sleeve 34 inwardly toward the stem.

In order to normally maintain the sleeve in a position in which thefrontrend of its bore will lie forwardly of the striking surface inreadiness to receive the head of a spike 3|, a compression spring 4| isdisposed within the enlarged portion 36 of the bore between the forwardsurface of the collar "and a shoulder 42 at the juncture of the portions36 and 31 of the bore.

The operation of the device is as follows:

Whenever it is intended to drive a spike 3| into a tie the drivingmechanism is so positioned,

that the striking surface 30 seats upon the spike. The reduced portion31 of the sleeve 34 will then encircle the head of the spike 3|, andrestrain the front end of the driving member against undue lateralmovement during the operation of the tool 2| which may then be operatedatja,

rapid speed with the fullassurance that substantially the correct,relationship will exist at all times between the driving mechanism andthe is a stem 35 work.

As the head of the spike approaches the tie the front end of the sleeve34 will abut the rail flange and remain stationary and thereafter onlythe driving mechanism will follow the spike until quickly attached toand from the hammer tool without necessitating the partial dismantlingof the latter. As will be readily observed, the shank of the drivingdevice is placed in the extreme front portion of the penumatic tool andthe retainer 28 engages the driving device in the same manner as it doesother types of working implements intended for use with the pneumatictool.

I claim:

1. A driving device for use with a percussive tool having a casing and areciprocatory hammer therein, comprising a driving member having a shankextending slidably into the casing to receive the blows of the hammer, astem on the driving member to bear against an element intended to bedriven, means on the driving member to abut the end of the casing forlimiting the distance that the shank may extend into the casing, andmeans supported by the stem to maintain said stem in operativerelationship with such element.

2. A driving device for use with a percussive tool having a casing and areciprocatory hammer therein, comprising a driving member having a shankextending siidabiy into the casing to receive the blows of the hammer, astem on the driving member to bear against an element intended to bedriven, a shoulder on the driving member to abut the end of the casingfor limiting the distance that the stem may extend into the casing, asleeve slidable on and supported by the stem for maintaining the stem inoperative relationship with such element, and means for retaining thesleeve on the stem.

3, A driving device for use with a percussive tool having a casing and areciprocatory hammer therein, comprising a driving member having a shankextending slidably into the casing to receive the blows of the hammer, astem on the driving member to bear against an element intended to bedriven, a flange at the juncture of the shank and the stem to seatagainst the end of the casing for limiting the distance that the shankmay extend into the casing, a sleeve slidabie on the stem formaintaining the stem in operative relationship with such element,portions on the stem and the sleeve cooperating with each other forretaining the sleeve on the stem, and a spring within the sleeve actingagainst the sleeve and the portion on the stem to urge the sleeveforwardly along the stem.

4.- A driving device for use with a percussive tool having a casing anda reciprocatory hammer therein, comprising a driving member having ashank extending slidably into the casing to receive the blows of thehammer, a stem on the driving member to engage an element intended to bedriven and having a collar between its ends, a sleeve siidable on thestem encircling the collar, and an introverted flange on the sleeveoverlying the rearward side of the collar to re tain the sleeve upon thestem.

5. A driving device for use with a percussive tool having a casing and areciprocatory hammer therein, comprising a driving member having a shankextending slidably into the casing to receive the blows of the hammer, aflange on the driving member to seat against an extremity of the casing,a stem forwardly of the flange to engage an element intended to bedriven and having a collar between its ends, a sleev slidable on thestem and encircling the collar, an introverted flang on the sleeveoverlying the collar to retain the sleeve upon the stem, a shoulderwithin the sleeve, a spring acting against th shoulder and the collar tourge the sleeve forwardly along the stem, and a retainer on the casingcooperating with the flange to retain the stem in the casing. ROY oALLEN

